Improvement in stop devices for sewing-machines



UNITED STATES PATENT OFFICE.

ALBERT L. DEWEY, OF WESTFIELD, MASSACHUSETTS.

IMPROVEMENT IN STOP DEVICES FOR SEWING-MACHINES.

Speoication forming part of Letters Patent No. 56,909, dated August 7 1866.

To all whom it may concern:

Be it known that I, ALBERT L. DEWEY, of Vesteld, in the county of Hampden, State of Massachusetts, have invented a newgand Improved Stop Device 5 and I do hereby declare that the following is afull, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had tothe accompanying drawings, forming part of this specification, in which- Figure lis a vertical section of my invention taken in the line c o, Fig. 2. Fig. 2is a transverse section of the same taken in the line d d, Fig. l. Fig. 3 is the same view as Fig. 1, showing a modification of the invention. Fig. 4 is a detached view of a spring pertaining to the same.

Similar letters of reference indicate corre,- sponding parts.

This invention relates to a new and improved stop device designed for sewing-machines and other mechanism where it is desired to cause a revolving.; shaft always to move in one and the same direction.

B represents a shaft supported in a suitable framing, (l C, having two bosses7 dxdx, upon it, rabbeted or grooved at their peripheries to receive a hollow or tubular hub, A, which is litted loosely on the hubs or bosses dx dx, the iianges e e formed by the rabbets or grooves in the latter preventing the hub from moving laterally thereon, as will be seen by referring to Fig. l.

D is a spiral spring, which is placed on the shaft B, between the two bosses dx dx, and consequently within the hub A. One end of this spring is connected to the hub A,as shown at f, the opposite end of the spring being free or disconnected.

The hub A is provided with a pulley, E, ex-

tending around its circumference, said pulley' conveying its motion to the machinery to be driven by means of a belt.

F represents theliy-wheel of the ordinary crank-treadle motion, to which the invention is attached, as shown in Figs. l and 3.

The operation is as follows: The action of the spring D is peculiar. When the shaft B is caused to revolve in the direction of the arrowl the spring D will be contracted and bear upon the shaft B, so as to cause the hub A, connected therewith, to rotate also, the spring forming the only connection between the shaf't B and the hub A, and consequently driving any machinery attached by means of the belt before referred to 5 but if by accident the shaft B should be started in the opposite direction, as shown by the arrow 2, Fig. 2, the springD will instantly relax and allow the shaft B to revolve loose within the hub A, thereby causing the pulley with its attached machinery to stop until the proper direction is given to shaft B, as abovedescribed.

In certain cases the pulley A may be dispensed with and the springD applied to shaft B, substantially as shown in Fig. 3, said spring being stationary by having one end, g', firmly attached to the framing C. In this case the shaft B will be allowed to move only in the proper direction. For instance, if the attempt be made torevolve the shaft B in the direction of the arrow 3, Fig. 3, the spring D will contract and bear on shaft B, and couple it with the framing G by means of the connection shown at g', Fig. 3 5 but when the motion is given in the direction of arrow 4, Fig. 3, the spring D relaxes and allows the shaft to revolve loose within it.

I claim as new and desire to secure by Letters Patent- The spring D, applied to shaft B, either with or without the hubbed pulley A E, substantially as shown and used, all arranged to op erate in the manner substantially as and for the purpose set forth.

ALBERT L. DEWEY.

Witnesses:

RICHARD E. MORGAN, MES. HELEN L. DEWEY. 

